Internal-combustion engine.



AfM.GHASR INTERNAL COMBUSTION ENGINE.

APPLICATION FILED JULY27,191L

Patented Feb. 4, 1913;

1 ATTORNEYS UNITED STATES PATENT OFFICE,

AQ'RIN M. CHASE, or" sYnaousE, NEW YORK.

INTERNAL-COMBUSTION"ENGINE.

Specification of Letters Patent.

,quires, substantially no lubrication, and

whereby gas and carbon deposits are prevented from entering between such portion of the piston and the opposing. inner face of the walls of the cylinder; and the invention consists in the combinations and constructions. hereinafter set forth and claimed.

In describing this invention,- reference is.

had to the accompanying drawingwhich is a vertical sectional view of the cylinder of my engine, and the piston movable therein, the remaining parts of the engine being omitted. v

1 is the cylinder and 2 the piston movable therein, the piston having at one end an extension 3 which is movable inthe hottest zone of the cylinder, and is of sli htly less diameter than the contiguous portion of the inner face of the cylinder and of slightly less diameter than the body or trunkportion 4 of the piston, which trunk portion is movable in the cooler zone of the cylinder, engages the inner face of the walls of the outer endportion of the cyliiider and is provided substantially centrally between its ends with the usual connecting means, as a pivot pin a, for a link or pitman transmitting power from, and to, the piston, such extension being provided -with suitable means for rendering the extension gas tight without receiving any of the strain due tov guidin and resisting the lateral strain or thrust upon the piston in its movement.

In the illustrated embodiment of In invention, such means consists of an ordinary piston ring or rings 5 located near the upper or inner end of the extension 3 and spaced apart from the base of the extension, such piston ring or rings 5 being of sufficient resiliency to merely en age the walls of the cylinder lightly. As t e piston rings 5 do not assist in'guiding and resisting the lateral thrust upon the piston in its reciprocating movement they require practically no lubrication; The piston is guided in its reciprocating -movement by the trunk or body portion 4 thereof, which may, if de sired, be provided with piston rings 6.

Owing to the construction set forth, the

Patented Feb. 4, 1913. Application filed July a7,-1911-;.,seria1 1wo. 640,740.

head or extension 3 ofthe piston which runs in the hottest zone of the iston chamber requires substantially no In rication, as a space 7 intervenes between-the periphery of such extension and the walls-of the cylin der and the gas or motive fluid is prevented bythe piston rings5 from following down alongfthe periphery of theext'e'nsion and depositing carbon or other matter tending to foul the cylinder.

The use of means for rendering the ex tension gas tight is particularly advantageous "in two-cycle engines. as such means prevents the motive .fluid from escaping through the exhaust 8, along the extension as the piston is rising, and also prevents the exploded charge from passing out through the exhaust 8 before the head of the piston uncovers the exhaust; and said means is particularly advantageous in engines of the four cycle type for the reason that it prevents the accumulation of carbon deposit in'the space between the extension and the walls of the cylinder.

What I claim is: I

1. In an internal combustion engine, a cylinder, and a piston movable in the cylinder, the piston being formed with a head having its periphery located close to, and disengaged from, the inner face of the cylinder,- the portion of the piston in rear of said head being of greater diameter than the same and directly engaging the inner face of the cylinder for guiding the piston in its movement, said head being provided.

with a piston ring engaging the inner face of the cylinder and arranged in advance of, and spaced apart from, said ,portion of the piston in rear of said head, substantially as described.

2, In an internal combustionen 'ne, a cylinder, and a piston movable in t e cylinder, the main body of. the piston being of substantially the same diameter as the contiguous portion of the inner face of the cylinder, the main body directly engaging said face and guiding the piston 1n its movement, the piston having an extension at one end forming the head of the piston, said extension being of less diameter than the contiguous portion of the inner face of the cylinder for causing a space to intervene in advance of said main body between the periphery of the extension and the inner face of the cylinder, and means near the end face of the extension for directly engaging the inner face of the cylinder and rendering the advance end of said space substantially of said end for preventing gas from enteringthe space between said end and the inner face of the cylinder, the rear end of the piston being movable in the cooler zone of the cylinder and formed of greater diameter than said advance end and directly engaging the inner face of the cylinder and guiding the piston, substantially as described.

4. In an internal combustion engine, a cylinder, and a piston movable in the cylinder, the main body of the piston being 'movnecting means arranged substantially centrally between its ends, the piston having an extension projecting in advance of one end of said main body and forming the head of the piston, the extension being movable in the hottest zone of the cylinder, and being of less diameter than the contiguous portion of the inner face of the cylinder for causing a space to intervene in. advance of said main body between the periphery of the extension and the inner face of the cylinder, and means near the advance end of the extension for directly engaging the inner face of the cylinder and rendering the advance end of said space substantially gas-tight.

In testimony whereof, I have hereunto signed my name in the presence of two attesting witnesses, at Syracuse, in the county of Onondaga, in the State of New York,

this 24th day of July, 1911.

AURIN M. CHASE. Witnesses:

S. DAVIS, F, B. SMITH. 

